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37 results on '"Clarke, Janet T."'

12. Ecosystem characteristics and processes facilitating persistent macrobenthic biomass hotspots and associated benthivory in the Pacific Arctic

Author

Grebmeier, Jacqueline M., Bluhm, Bodil A., Cooper, Lee W., Danielson, Seth L., Arrigo, Kevin R., Blanchard, Arny L., Clarke, Janet T., Day, Robert H., Frey, Karen E., Gradinger, Rolf R., Kędra, Monika, Konar, Brenda, Kuletz, Kathy J., Lee, Sang H., Lovvorn, James R., Norcross, Brenda L., and Okkonen, Stephen R.

Published
2015
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19. Beluga whales in the western Beaufort Sea: Current state of knowledge on timing, distribution, habitat use and environmental drivers

Author

Stafford, Kathleen M., primary, Ferguson, Megan C., additional, Hauser, Donna D.W., additional, Okkonen, Stephen R., additional, Berchok, Catherine L., additional, Citta, John J., additional, Clarke, Janet T., additional, Garland, Ellen C., additional, Jones, Joshua, additional, and Suydam, Robert S., additional

Published
2018
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29. Summary of Marine Mammal Occurrence and Population Estimates in U.S. Coastal Waters Subject to Military Aircraft Overflights.

Author

SCIENCE APPLICATIONS INTERNATIONAL CORPSAN DIEGO CA, Moore, Sue E., Clarke, Janet T., SCIENCE APPLICATIONS INTERNATIONAL CORPSAN DIEGO CA, Moore, Sue E., and Clarke, Janet T.

Abstract

This technical report summarizes marine mammal occurrence data for five separate regions along coastal U.S. where military overflights occur. The five regions are the Northeast Pacific, Southeast Pacific, Gulf of Mexico, Southwest Atlantic, and Northwest Atlantic. The data include marine mammal species summary tables that provide the species common and scientific names, stock identity and most recent estimate of population size, seasonal occurrence index, dive profile, and comments. The information summarized in the tables presents "generalities" with some data based on better information than others.

Published
1998

30. Presence and behavior of bowhead whales (Balaena mysticetus) in the Alaskan Beaufort Sea in July 2011.

Author

Christman, Cynthia L., Citta, John J., Quakenbush, Lori T., Clarke, Janet T., Rone, Brenda K., Shea, Rebecca A., Ferguson, Megan C., and Heide-Jørgensen, Mads Peter

Subjects
BOWHEAD whale, ANIMAL behavior, BALAENA, FISHERIES
Abstract

The Western Arctic bowhead whale ( Balaena mysticetus) is highly adapted to sea ice and annually migrates through the Bering, Chukchi, and Beaufort seas. While the overall distribution and seasonal movements of bowhead whales are mostly understood, information about their distribution in the Alaskan Beaufort Sea in early to mid-summer has not been well documented. In July 2011, we conducted an exploratory flight in the Alaskan Beaufort Sea, north of Camden Bay (71°N 144°W), near the location of a single satellite-tagged bowhead whale. Eighteen bowhead whales were observed, and behavior consistent with feeding was documented. To our knowledge, this is the first documentation of behavior consistent with feeding north of Camden Bay in mid-July. Few studies have focused on bowhead whale distribution in the Alaskan Beaufort Sea in early to mid-summer, and no long-term, region-wide surveys have been conducted during summer. Bowhead whales are already exposed to anthropogenic disturbance in the Canadian Beaufort Sea in summer, the Alaskan Beaufort Sea in fall, and the Chukchi and Bering seas from fall through spring. The presence of bowhead whale aggregations in the Alaskan Beaufort Sea in summer should be considered when assessing the cumulative effects of human-related activities. [ABSTRACT FROM AUTHOR]

Published
2013
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33. Distribution, Abundance, Behavior, and Bioacoustics of Endangered Whales in the Western Beaufort and Northeastern Chukchi Seas, 1979-87

Author

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, Ljungblad, Donald K., Moore, Sue E., Clarke, Janet T., Bennett, John C., NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, Ljungblad, Donald K., Moore, Sue E., Clarke, Janet T., and Bennett, John C.

Abstract

Aerial surveys of bowhead whales and, secondarily, other marine mammals were made from 1 Sep - 23 Oct 1987 in the western Beaufort and northeastern Chukchi Seas. A shore-based acoustic monitoring station was maintained at Barrow, Alaska from 9 Sept 21 Oct 1987 to record the calls of migrating bowhead whales as they passed into the northeastern Chukchi Sea. Survey results and observations on bowhead whale distribution, relative abundance and density, migration patterns, general behavior, and sound production are presented. Presented also are survey results and observations on gray whale distribution, relative abundance, and general behavior on belukha and walrus distribution, and relative abundance. Incidental sightings of all marine mammals are reported. This report also summarizes the study efforts made between 1979 and 1987. Keywords: Balaena mysticetus, Eschrichtius robustus, Geographical distribution, Autumn, Marine biological noise, Tracking, Alaska, Chukchi Sea, Beaufort Sea, Animal migration, Whale population, Habitat, Whale behavior, Population density., Prepared in collaboration with SEACO.

Published
1988

34. Distribution, Abundance, Behavior, and Bioacoustics of Endangered Whales in the Alaskan Beaufort and Eastern Chukchi Seas, 1979-86.

Author

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, Ljungblad,Donald K, Moore,Sue E, Clarke,Janet T, Bennett,John C, NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA, Ljungblad,Donald K, Moore,Sue E, Clarke,Janet T, and Bennett,John C

Abstract

Aerial surveys and acoustic recordings of bowhead whales and, secondarily, other marine mammals were made from mid-August 1986 through October 1986 in the eastern Chukchi and Alaskan Beaufort Sea. In addition, a shore-based acoustic station was established on Barter Island, Alaska to record the calls of migrating bowhead whales as they passed through the eastern Alaskan Beaufort Sea. Survey results and observations on bowhead whale distribution, relative abundance and density, migration patterns, general behavior, and sound production are presented. Presented here also are survey results and observations on gray whale distribution, relative abundance, and general behavior. Incidental sightings of all marine mammals are reported.

Published
1987

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